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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
My first attempt didn't work on 'Attempt', it came back with an 'undefined' error. I checked my browser's console (Chrome), and it gave me the error 'cannot call replaced on undefined'. I wasn't trying to call a 'replaced' method anywhere myself. And I've since learned has happened to a few others on CodeWars (unsure whether it was this particular Kata, or otherwise)